Akemi Iwaya is a devoted Mozilla Firefox user who enjoys working with multiple browsers and occasionally dabbling with Linux. She also loves reading fantasy and sci-fi stories as well as playing "old school" role-playing games. You can visit her on Twitter and Google+.

Actually the 4th dimension is one of those theoretical things like string theory. And time has nothing to do with the speed of light. Light moves at it’s given velocity. It’s just a quirk of how we measure speed. Rate of change in position over time.

You see einstein had the idea that gravity wasn’t really a force as much as it the terrain of the 4th Dimension creating bulges and dips.

The video pretty much explains one of the loopholes in the 4D theory. If you take that into consideration, orbits would decay much more rapidly.

Velocity isn’t speed, but rate of change of speed. Something slowing down, or speeding up, has negative or positive velocity. A car, or a star-ship, maintaining a constant speed, has no velocity (sometimes wrongly referred to as neutral velocity.

I thought that was 2 very well spent minutes. Thank you, HTG, for putting it up on your site, and please continue to consider putting up somewhat non-techy “how things work” videos like this in the future.

DID YOU KNOW?

Although Velociraptors are portrayed in Jurassic Park as large and terrifying, in real life they were barely half as tall as a human; the dinosaurs in the film were actually more similar to the species Deinonychus.